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2fe8c1c08b
linux_dsm_epyc7002/fs/xfs
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Dave Chinner 2fe8c1c08b xfs: open code inc_inode_iversion when logging an inode 
Michael L Semon reported that generic/069 runtime increased on v5
superblocks by 100% compared to v4 superblocks. his perf-based
analysis pointed directly at the timestamp updates being done by the
write path in this workload. The append writers are doing 4-byte
writes, so there are lots of timestamp updates occurring.

The thing is, they aren't being triggered by timestamp changes -
they are being triggered by the inode change counter needing to be
updated. That is, every write(2) system call needs to bump the inode
version count, and it does that through the timestamp update
mechanism. Hence for v5 filesystems, test generic/069 is running 3
orders of magnitude more timestmap update transactions on v5
filesystems due to the fact it does a huge number of *4 byte*
write(2) calls.

This isn't a real world scenario we really need to address - anyone
doing such sequential IO should be using fwrite(3), not write(2).
i.e. fwrite(3) buffers the writes in userspace to minimise the
number of write(2) syscalls, and the problem goes away.

However, there is a small change we can make to improve the
situation - removing the expensive lock operation on the change
counter update.  All inode version counter changes in XFS occur
under the ip->i_ilock during a transaction, and therefore we
don't actually need the spin lock that provides exclusive access to
it through inc_inode_iversion().

Hence avoid the lock and just open code the increment ourselves when
logging the inode.

Reported-by: Michael L. Semon <mlsemon35@gmail.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
2013-11-18 09:42:08 -06:00
..
Kconfig xfs: introduce CONFIG_XFS_WARN 2013-05-07 18:45:36 -05:00
kmem.c xfs: simplify kmem_{zone_}zalloc 2013-11-06 16:31:27 -06:00
kmem.h xfs: simplify kmem_{zone_}zalloc 2013-11-06 16:31:27 -06:00
Makefile xfs: abstract the differences in dir2/dir3 via an ops vector 2013-10-30 13:37:38 -05:00
mrlock.h xfs: introduce CONFIG_XFS_WARN 2013-05-07 18:45:36 -05:00
time.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
uuid.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
uuid.h xfs: add CRC infrastructure 2012-11-19 20:11:24 -06:00
xfs_acl.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_acl.h xfs: increase number of ACL entries for V5 superblocks 2013-06-06 10:52:15 -05:00
xfs_ag.h xfs: create a shared header file for format-related information 2013-10-23 14:11:30 -05:00
xfs_alloc_btree.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_alloc_btree.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_alloc.c xfs: add tracepoints to AGF/AGI read operations 2013-11-06 12:42:52 -06:00
xfs_alloc.h xfs: create a shared header file for format-related information 2013-10-23 14:11:30 -05:00
xfs_aops.c xfs: prevent stack overflows from page cache allocation 2013-10-30 15:44:51 -05:00
xfs_aops.h direct-io: Implement generic deferred AIO completions 2013-09-04 09:23:46 -04:00
xfs_attr_inactive.c xfs: vectorise encoding/decoding directory headers 2013-10-30 13:47:22 -05:00
xfs_attr_leaf.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_attr_leaf.h xfs: unify directory/attribute format definitions 2013-10-23 14:21:40 -05:00
xfs_attr_list.c xfs: vectorise encoding/decoding directory headers 2013-10-30 13:47:22 -05:00
xfs_attr_remote.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_attr_remote.h xfs: unify directory/attribute format definitions 2013-10-23 14:21:40 -05:00
xfs_attr_sf.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00
xfs_attr.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_attr.h xfs: kill xfs_vnodeops.[ch] 2013-08-12 16:53:39 -05:00
xfs_bit.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_bit.h
xfs_bmap_btree.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_bmap_btree.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_bmap_util.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_bmap_util.h xfs: fold xfs_change_file_space into xfs_ioc_space 2013-10-21 16:57:03 -05:00
xfs_bmap.c xfs: fix unlock in xfs_bmap_add_attrfork 2013-11-18 09:12:54 -06:00
xfs_bmap.h xfs: remove __KERNEL__ from debug code 2013-08-12 16:58:37 -05:00
xfs_btree.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_btree.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_buf_item.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_buf_item.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_buf.c xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_buf.h xfs: rework buffer dispose list tracking 2013-09-10 18:56:31 -04:00
xfs_cksum.h xfs: add CRC infrastructure 2012-11-19 20:11:24 -06:00
xfs_da_btree.c xfs: convert directory vector functions to constants 2013-10-30 13:49:18 -05:00
xfs_da_btree.h xfs: abstract the differences in dir2/dir3 via an ops vector 2013-10-30 13:37:38 -05:00
xfs_da_format.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_da_format.h xfs: convert directory vector functions to constants 2013-10-30 13:48:41 -05:00
xfs_dinode.h xfs: di_flushiter considered harmful 2013-07-25 10:41:42 -05:00
xfs_dir2_block.c xfs: convert directory vector functions to constants 2013-10-30 13:49:18 -05:00
xfs_dir2_data.c xfs: validity check the directory block leaf entry count 2013-10-30 13:57:14 -05:00
xfs_dir2_leaf.c xfs: convert directory vector functions to constants 2013-10-30 13:49:18 -05:00
xfs_dir2_node.c xfs:xfs_dir2_node.c: pointer use before check for null 2013-10-30 15:53:14 -05:00
xfs_dir2_priv.h xfs: vectorise encoding/decoding directory headers 2013-10-30 13:47:22 -05:00
xfs_dir2_readdir.c xfs: convert directory vector functions to constants 2013-10-30 13:49:18 -05:00
xfs_dir2_sf.c xfs: convert directory vector functions to constants 2013-10-30 13:49:18 -05:00
xfs_dir2.c xfs: convert directory vector functions to constants 2013-10-30 13:49:18 -05:00
xfs_dir2.h xfs: convert directory vector functions to constants 2013-10-30 13:49:18 -05:00
xfs_discard.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_discard.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_dquot_buf.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_dquot_item.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_dquot_item.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_dquot.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_dquot.h xfs: create a shared header file for format-related information 2013-10-23 14:11:30 -05:00
xfs_error.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_error.h xfs: kill support/debug.[ch] 2011-03-07 10:09:35 +11:00
xfs_export.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_export.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_extent_busy.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_extent_busy.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_extfree_item.c xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_extfree_item.h xfs: split out EFI/EFD log item format definition 2013-08-12 16:07:13 -05:00
xfs_file.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_filestream.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_filestream.h xfs: xfs_filestreams.h doesn't need __KERNEL__ 2013-08-12 17:00:11 -05:00
xfs_format.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_fs.h xfs: add the inode directory type support to XFS_IOC_FSGEOM 2013-10-08 14:28:09 -05:00
xfs_fsops.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_fsops.h xfs: ensure log covering transactions are synchronous 2011-01-11 20:28:17 -06:00
xfs_globals.c xfs: add background scanning to clear eofblocks inodes 2012-11-08 15:34:59 -06:00
xfs_ialloc_btree.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_ialloc_btree.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_ialloc.c xfs: add tracepoints to AGF/AGI read operations 2013-11-06 12:42:52 -06:00
xfs_ialloc.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_icache.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_icache.h xfs: update #2 for v3.12-rc1 2013-09-12 16:13:41 -07:00
xfs_icreate_item.c xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_icreate_item.h xfs: separate icreate log format definitions from xfs_icreate_item.h 2013-08-12 16:10:35 -05:00
xfs_inode_buf.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_inode_buf.h xfs: create a shared header file for format-related information 2013-10-23 14:11:30 -05:00
xfs_inode_fork.c xfs: fix the extent count when allocating an new indirection array entry 2013-10-31 16:43:19 -05:00
xfs_inode_fork.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_inode_item.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_inode_item.h xfs: split out inode log item format definition 2013-08-12 16:05:19 -05:00
xfs_inode.c xfs: xfs_remove deadlocks due to inverted AGF vs AGI lock ordering 2013-11-04 13:18:48 -06:00
xfs_inode.h xfs: abstract the differences in dir2/dir3 via an ops vector 2013-10-30 13:37:38 -05:00
xfs_inum.h xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_ioctl32.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_ioctl32.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_ioctl.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_ioctl.h xfs: consolidate extent swap code 2013-08-12 16:56:06 -05:00
xfs_iomap.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_iomap.h xfs: get rid of count from xfs_iomap_write_allocate() 2013-10-01 15:42:34 -05:00
xfs_iops.c xfs: prevent stack overflows from page cache allocation 2013-10-30 15:44:51 -05:00
xfs_iops.h xfs: fold xfs_change_file_space into xfs_ioc_space 2013-10-21 16:57:03 -05:00
xfs_itable.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_itable.h xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_linux.h xfs: remove two unused macro definitions in xfs_linux.h 2013-08-20 15:30:23 -05:00
xfs_log_cil.c xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_log_format.h xfs: create a shared header file for format-related information 2013-10-23 14:11:30 -05:00
xfs_log_priv.h xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_log_recover.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_log_recover.h xfs: Clean up XFS_BLI_* flag namespace 2010-05-24 10:33:39 -05:00
xfs_log_rlimit.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_log.c xfs: trace AIL manipulations 2013-11-06 12:41:51 -06:00
xfs_log.h xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_message.c xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_message.h xfs: introduce CONFIG_XFS_WARN 2013-05-07 18:45:36 -05:00
xfs_mount.c xfs: increase inode cluster size for v5 filesystems 2013-11-18 09:29:36 -06:00
xfs_mount.h xfs: increase inode cluster size for v5 filesystems 2013-11-18 09:29:36 -06:00
xfs_mru_cache.c xfs: convert to alloc_workqueue() 2011-02-01 11:42:43 +01:00
xfs_mru_cache.h xfs: Kill filestreams cache flush 2010-01-15 15:34:22 -06:00
xfs_qm_bhv.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_qm_syscalls.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_qm.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_qm.h xfs: split dquot buffer operations out 2013-10-23 14:28:35 -05:00
xfs_quota_defs.h xfs: split dquot buffer operations out 2013-10-23 14:28:35 -05:00
xfs_quota_priv.h xfs: use per-filesystem radix trees for dquot lookup 2012-03-14 11:09:06 -05:00
xfs_quota.h xfs: split dquot buffer operations out 2013-10-23 14:28:35 -05:00
xfs_quotaops.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_rtalloc.c xfs: split xfs_rtalloc.c for userspace sanity 2013-10-23 17:16:32 -05:00
xfs_rtalloc.h xfs: split xfs_rtalloc.c for userspace sanity 2013-10-23 17:16:32 -05:00
xfs_rtbitmap.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_sb.c xfs: be more forgiving of a v4 secondary sb w/ junk in v5 fields 2013-10-30 16:38:29 -05:00
xfs_sb.h xfs: create a shared header file for format-related information 2013-10-23 14:11:30 -05:00
xfs_shared.h xfs: create a shared header file for format-related information 2013-10-23 14:11:30 -05:00
xfs_stats.c xfs: use common code for quota statistics 2012-03-14 11:09:06 -05:00
xfs_stats.h xfs: use common code for quota statistics 2012-03-14 11:09:06 -05:00
xfs_super.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_super.h xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_symlink_remote.c xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_symlink.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_symlink.h xfs: push down inactive transaction mgmt for remote symlinks 2013-10-08 14:53:02 -05:00
xfs_sysctl.c xfs: Convert use of typedef ctl_table to struct ctl_table 2013-06-17 17:42:25 -05:00
xfs_sysctl.h xfs: add background scanning to clear eofblocks inodes 2012-11-08 15:34:59 -06:00
xfs_trace.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_trace.h xfs: add tracepoints to AGF/AGI read operations 2013-11-06 12:42:52 -06:00
xfs_trans_ail.c xfs: trace AIL manipulations 2013-11-06 12:41:51 -06:00
xfs_trans_buf.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_trans_dquot.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_trans_extfree.c xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_trans_inode.c xfs: open code inc_inode_iversion when logging an inode 2013-11-18 09:42:08 -06:00
xfs_trans_priv.h xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_trans_resv.c xfs: increase inode cluster size for v5 filesystems 2013-11-18 09:29:36 -06:00
xfs_trans_resv.h xfs: Get rid of all XFS_XXX_LOG_RES() macro 2013-08-12 17:48:08 -05:00
xfs_trans_space.h
xfs_trans.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_trans.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_types.h xfs: Add read-only support for dirent filetype field 2013-08-22 08:40:24 -05:00
xfs_vnode.h xfs: clean up xfs_inactive() error handling, kill VN_INACTIVE_[NO]CACHE 2013-10-08 17:20:41 -05:00
xfs_xattr.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs.h xfs: introduce CONFIG_XFS_WARN 2013-05-07 18:45:36 -05:00